src/jtag/presto.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Pavel Chromy                                    *
   3  *   chromy@asix.cz                                                        *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #if IS_CYGWIN == 1
  25 #include "windows.h"
  26 #endif
  27
  28 #include "replacements.h"
  29
  30 /* project specific includes */
  31 #include "log.h"
  32 #include "types.h"
  33 #include "jtag.h"
  34 #include "configuration.h"
  35 #include "time_support.h"
  36 #include "bitq.h"
  37
  38 /* system includes */
  39 #include <string.h>
  40 #include <stdlib.h>
  41 #include <unistd.h>
  42
  43 #include <sys/time.h>
  44 #include <time.h>
  45
  46 /* PRESTO access library includes */
  47 #if BUILD_PRESTO_FTD2XX == 1
  48 #include <ftd2xx.h>
  49 #elif BUILD_PRESTO_LIBFTDI == 1
  50 #include <ftdi.h>
  51 #else
  52 #error "BUG: either FTD2XX and LIBFTDI has to be used"
  53 #endif
  54
  55
  56 int presto_jtag_speed(int speed);
  57 int presto_jtag_register_commands(struct command_context_s *cmd_ctx);
  58 int presto_jtag_init(void);
  59 int presto_jtag_quit(void);
  60
  61 jtag_interface_t presto_interface =
  62 {
  63         .name = "presto",
  64         .execute_queue = bitq_execute_queue,
  65         .speed = presto_jtag_speed,
  66         .register_commands = presto_jtag_register_commands,
  67         .init = presto_jtag_init,
  68         .quit = presto_jtag_quit,
  69 };
  70
  71
  72 int presto_bitq_out(int tms, int tdi, int tdo_req);
  73 int presto_bitq_flush(void);
  74 int presto_bitq_sleep(unsigned long us);
  75 int presto_bitq_reset(int trst, int srst);
  76 int presto_bitq_in_rdy(void);
  77 int presto_bitq_in(void);
  78
  79 bitq_interface_t presto_bitq =
  80 {
  81         .out = presto_bitq_out,
  82         .flush = presto_bitq_flush,
  83         .sleep = presto_bitq_sleep,
  84         .reset = presto_bitq_reset,
  85         .in_rdy = presto_bitq_in_rdy,
  86         .in = presto_bitq_in,
  87 };
  88
  89
  90 /* -------------------------------------------------------------------------- */
  91
  92
  93 #define FT_DEVICE_NAME_LEN 64
  94 #define FT_DEVICE_SERNUM_LEN 64
  95
  96 #define PRESTO_VID_PID 0x0403f1a0
  97 #define PRESTO_VID (0x0403)
  98 #define PRESTO_PID (0xf1a0)
  99
 100 #define BUFFER_SIZE (64*62)
 101
 102 typedef struct presto_s
 103 {
 104 #if BUILD_PRESTO_FTD2XX == 1
 105         FT_HANDLE handle;
 106         FT_STATUS status;
 107 #elif BUILD_PRESTO_LIBFTDI == 1
 108         struct ftdi_context ftdic;
 109         int retval;
 110 #endif
 111
 112         char serial[FT_DEVICE_SERNUM_LEN];
 113
 114         u8 buff_out[BUFFER_SIZE];
 115         int buff_out_pos;
 116
 117         u8 buff_in[BUFFER_SIZE];
 118         int buff_in_exp; /* expected in buffer length */
 119         int buff_in_len; /* length of data received */
 120         int buff_in_pos;
 121
 122         unsigned long total_out;
 123         unsigned long total_in;
 124
 125         int jtag_tms; /* last tms state */
 126         int jtag_tck; /* last tck state */
 127
 128         int jtag_tdi_data;
 129         int jtag_tdi_count;
 130
 131 } presto_t;
 132
 133 presto_t presto_state;
 134 presto_t *presto = &presto_state;
 135
 136 u8 presto_init_seq[] =
 137 {
 138         0x80, 0xA0, 0xA8, 0xB0, 0xC0, 0xE0
 139 };
 140
 141 int presto_write(u8 *buf, int size)
 142 {
 143 #if BUILD_PRESTO_FTD2XX == 1
 144         DWORD ftbytes;
 145         if ((presto->status = FT_Write(presto->handle, buf, size, &ftbytes)) != FT_OK)
 146         {
 147                 LOG_ERROR("FT_Write returned: %lu", presto->status);
 148                 return ERROR_JTAG_DEVICE_ERROR;
 149         }
 150
 151 #elif BUILD_PRESTO_LIBFTDI == 1
 152         u32 ftbytes;
 153         if ((presto->retval = ftdi_write_data(&presto->ftdic, buf, size)) < 0)
 154         {
 155                 LOG_ERROR("ftdi_write_data: %s", ftdi_get_error_string(&presto->ftdic));
 156                 return ERROR_JTAG_DEVICE_ERROR;
 157         }
 158         ftbytes = presto->retval;
 159 #endif
 160
 161         if (ftbytes != size)
 162         {
 163                 LOG_ERROR("couldn't write the requested number of bytes to PRESTO (%i < %i)", ftbytes, size);
 164                 return ERROR_JTAG_DEVICE_ERROR;
 165         }
 166
 167         return ERROR_OK;
 168 }
 169
 170 int presto_read(u8* buf, int size)
 171 {
 172 #if BUILD_PRESTO_FTD2XX == 1
 173         DWORD ftbytes;
 174         if ((presto->status = FT_Read(presto->handle, buf, size, &ftbytes)) != FT_OK)
 175         {
 176                 LOG_ERROR("FT_Read returned: %lu", presto->status);
 177                 return ERROR_JTAG_DEVICE_ERROR;
 178         }
 179
 180 #elif BUILD_PRESTO_LIBFTDI == 1
 181         u32 ftbytes = 0;
 182
 183         struct timeval timeout, now;
 184         gettimeofday(&timeout, NULL);
 185         timeval_add_time(&timeout, 1, 0); /* one second timeout */
 186
 187         while (ftbytes < size)
 188         {
 189                 if ((presto->retval = ftdi_read_data(&presto->ftdic, buf + ftbytes, size - ftbytes)) < 0)
 190                 {
 191                         LOG_ERROR("ftdi_read_data: %s", ftdi_get_error_string(&presto->ftdic));
 192                         return ERROR_JTAG_DEVICE_ERROR;
 193                 }
 194                 ftbytes += presto->retval;
 195
 196                 gettimeofday(&now, NULL);
 197                 if ((now.tv_sec > timeout.tv_sec) || ((now.tv_sec == timeout.tv_sec) && (now.tv_usec > timeout.tv_usec)))
 198                         break;
 199         }
 200 #endif
 201
 202         if (ftbytes != size)
 203         {
 204                 /* this is just a warning, there might have been timeout when detecting PRESTO, which is not fatal */
 205                 LOG_WARNING("couldn't read the requested number of bytes from PRESTO (%i < %i)", ftbytes, size);
 206                 return ERROR_JTAG_DEVICE_ERROR;
 207         }
 208
 209         return ERROR_OK;
 210 }
 211
 212 #if BUILD_PRESTO_FTD2XX == 1
 213 int presto_open_ftd2xx(char *req_serial)
 214 {
 215         int i;
 216         DWORD numdevs;
 217         DWORD vidpid;
 218         char devname[FT_DEVICE_NAME_LEN];
 219         FT_DEVICE device;
 220
 221         BYTE presto_data;
 222         DWORD ftbytes;
 223
 224         presto->handle = (FT_HANDLE)INVALID_HANDLE_VALUE;
 225
 226 #if IS_WIN32 == 0
 227         /* Add non-standard Vid/Pid to the linux driver */
 228         if ((presto->status = FT_SetVIDPID(PRESTO_VID, PRESTO_PID)) != FT_OK)
 229         {
 230                 LOG_ERROR("couldn't add PRESTO VID/PID");
 231                 exit(-1);
 232         }
 233 #endif
 234
 235         if ((presto->status = FT_ListDevices(&numdevs, NULL, FT_LIST_NUMBER_ONLY)) != FT_OK)
 236         {
 237                 LOG_ERROR("FT_ListDevices failed: %i", (int)presto->status);
 238                 return ERROR_JTAG_DEVICE_ERROR;
 239         }
 240
 241         LOG_DEBUG("FTDI devices available: %i", numdevs);
 242         for (i = 0; i < numdevs; i++)
 243         {
 244                 if ((presto->status = FT_Open(i, &(presto->handle))) != FT_OK)
 245                 {
 246                         /* this is not fatal, the device may be legitimately open by other process, hence debug message only */
 247                         LOG_DEBUG("FT_Open failed: %i", (int)presto->status);
 248                         continue;
 249                 }
 250                 LOG_DEBUG("FTDI device %i open", i);
 251
 252                 if ((presto->status = FT_GetDeviceInfo(presto->handle, &device, &vidpid,
 253                                 presto->serial, devname, NULL)) == FT_OK)
 254                 {
 255                         if (vidpid == PRESTO_VID_PID
 256                                         && (req_serial == NULL || !strcmp(presto->serial, req_serial)))
 257                                 break;
 258                 }
 259                 else
 260                         LOG_DEBUG("FT_GetDeviceInfo failed: %i", presto->status);
 261
 262                 LOG_DEBUG("FTDI device %i does not match, closing", i);
 263                 FT_Close(presto->handle);
 264                 presto->handle = (FT_HANDLE)INVALID_HANDLE_VALUE;
 265         }
 266
 267         if (presto->handle == (FT_HANDLE)INVALID_HANDLE_VALUE)
 268                 return ERROR_JTAG_DEVICE_ERROR; /* presto not open, return */
 269
 270         if ((presto->status = FT_SetLatencyTimer(presto->handle, 1)) != FT_OK)
 271                 return ERROR_JTAG_DEVICE_ERROR;
 272
 273
 274         if ((presto->status = FT_SetTimeouts(presto->handle, 100, 0)) != FT_OK)
 275                 return ERROR_JTAG_DEVICE_ERROR;
 276
 277         if ((presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX)) != FT_OK)
 278                 return ERROR_JTAG_DEVICE_ERROR;
 279
 280         presto_data = 0xD0;
 281         if ((presto->status = FT_Write(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 282                 return ERROR_JTAG_DEVICE_ERROR;
 283
 284         /* delay between first write/read turnaround (after purge?) necessary under Linux for unknown reason,
 285            probably a bug in library threading */
 286         usleep(100000);
 287         if ((presto->status = FT_Read(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 288                 return ERROR_JTAG_DEVICE_ERROR;
 289
 290         if (ftbytes!=1)
 291         {
 292                 LOG_DEBUG("PRESTO reset");
 293
 294                 if ((presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX)) != FT_OK)
 295                         return ERROR_JTAG_DEVICE_ERROR;
 296                 if ((presto->status = FT_SetBitMode(presto->handle, 0x80, 1)) != FT_OK)
 297                         return ERROR_JTAG_DEVICE_ERROR;
 298                 if ((presto->status = FT_SetBaudRate(presto->handle, 9600)) != FT_OK)
 299                         return ERROR_JTAG_DEVICE_ERROR;
 300
 301                 presto_data = 0;
 302                 for (i = 0; i < 4 * 62; i++)
 303                         if ((presto->status=FT_Write(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 304                                 return ERROR_JTAG_DEVICE_ERROR;
 305
 306                 usleep(100000);
 307
 308                 if ((presto->status = FT_SetBitMode(presto->handle, 0x00, 0)) != FT_OK)
 309                         return ERROR_JTAG_DEVICE_ERROR;
 310
 311                 if ((presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX)) != FT_OK)
 312                         return ERROR_JTAG_DEVICE_ERROR;
 313
 314                 presto_data = 0xD0;
 315                 if ((presto->status = FT_Write(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 316                         return ERROR_JTAG_DEVICE_ERROR;
 317
 318                 /* delay between first write/read turnaround (after purge?) necessary under Linux for unknown reason,
 319                    probably a bug in library threading */
 320                 usleep(100000);
 321                 if ((presto->status = FT_Read(presto->handle, &presto_data, 1, &ftbytes)) != FT_OK)
 322                         return ERROR_JTAG_DEVICE_ERROR;
 323
 324                 if (ftbytes!=1)
 325                 {
 326                         LOG_DEBUG("PRESTO not responding");
 327                         return ERROR_JTAG_DEVICE_ERROR;
 328                 }
 329         }
 330
 331         if ((presto->status = FT_SetTimeouts(presto->handle, 0, 0)) != FT_OK)
 332                 return ERROR_JTAG_DEVICE_ERROR;
 333
 334
 335         presto->status = FT_Write(presto->handle, &presto_init_seq, sizeof(presto_init_seq), &ftbytes);
 336         if (presto->status != FT_OK || ftbytes != sizeof(presto_init_seq))
 337                 return ERROR_JTAG_DEVICE_ERROR;
 338
 339         return ERROR_OK;
 340 }
 341
 342 #elif BUILD_PRESTO_LIBFTDI == 1
 343 int presto_open_libftdi(char *req_serial)
 344 {
 345         u8 presto_data;
 346
 347         LOG_DEBUG("searching for PRESTO using libftdi");
 348
 349         /* initialize FTDI context structure */
 350         if (ftdi_init(&presto->ftdic) < 0)
 351         {
 352                 LOG_ERROR("unable to init libftdi: %s", presto->ftdic.error_str);
 353                 return ERROR_JTAG_DEVICE_ERROR;
 354         }
 355
 356         /* context, vendor id, product id */
 357         if (ftdi_usb_open_desc(&presto->ftdic, PRESTO_VID, PRESTO_PID, NULL, req_serial) < 0)
 358         {
 359                 LOG_ERROR("unable to open PRESTO: %s", presto->ftdic.error_str);
 360                 return ERROR_JTAG_DEVICE_ERROR;
 361         }
 362
 363         if (ftdi_usb_reset(&presto->ftdic) < 0)
 364         {
 365                 LOG_ERROR("unable to reset PRESTO device");
 366                 return ERROR_JTAG_DEVICE_ERROR;
 367         }
 368
 369         if (ftdi_set_latency_timer(&presto->ftdic, 1) < 0)
 370         {
 371                 LOG_ERROR("unable to set latency timer");
 372                 return ERROR_JTAG_DEVICE_ERROR;
 373         }
 374
 375         if (ftdi_usb_purge_buffers(&presto->ftdic) < 0)
 376         {
 377                 LOG_ERROR("unable to purge PRESTO buffers");
 378                 return ERROR_JTAG_DEVICE_ERROR;
 379         }
 380
 381         presto_data = 0xD0;
 382         if (presto_write(&presto_data, 1) != ERROR_OK)
 383         {
 384                 LOG_ERROR("error writing to PRESTO");
 385                 return ERROR_JTAG_DEVICE_ERROR;
 386         }
 387
 388         if (presto_read(&presto_data, 1) != ERROR_OK)
 389         {
 390                 LOG_DEBUG("no response from PRESTO, retrying");
 391
 392                 if (ftdi_usb_purge_buffers(&presto->ftdic) < 0)
 393                         return ERROR_JTAG_DEVICE_ERROR;
 394
 395                 presto_data = 0xD0;
 396                 if (presto_write(&presto_data, 1) != ERROR_OK)
 397                         return ERROR_JTAG_DEVICE_ERROR;
 398
 399                 if (presto_read(&presto_data, 1) != ERROR_OK)
 400                 {
 401                         LOG_ERROR("no response from PRESTO, giving up");
 402                         return ERROR_JTAG_DEVICE_ERROR;
 403                 }
 404         }
 405
 406         if (presto_write(presto_init_seq, sizeof(presto_init_seq)) != ERROR_OK)
 407         {
 408                 LOG_ERROR("error writing PRESTO init sequence");
 409                 return ERROR_JTAG_DEVICE_ERROR;
 410         }
 411
 412         return ERROR_OK;
 413 }
 414 #endif /* BUILD_PRESTO_LIBFTDI == 1 */
 415
 416 int presto_open(char *req_serial)
 417 {
 418         presto->buff_out_pos=0;
 419         presto->buff_in_pos=0;
 420         presto->buff_in_len=0;
 421         presto->buff_in_exp=0;
 422
 423         presto->total_out=0;
 424         presto->total_in=0;
 425
 426         presto->jtag_tms=0;
 427         presto->jtag_tck=0;
 428         presto->jtag_tdi_data=0;
 429         presto->jtag_tdi_count=0;
 430
 431 #if BUILD_PRESTO_FTD2XX == 1
 432         return presto_open_ftd2xx(req_serial);
 433 #elif BUILD_PRESTO_LIBFTDI == 1
 434         return presto_open_libftdi(req_serial);
 435 #endif
 436 }
 437
 438 int presto_close(void)
 439 {
 440
 441         int result = ERROR_OK;
 442
 443 #if BUILD_PRESTO_FTD2XX == 1
 444         unsigned long ftbytes;
 445
 446         if (presto->handle == (FT_HANDLE)INVALID_HANDLE_VALUE)
 447                 return result;
 448
 449         presto->status = FT_Purge(presto->handle, FT_PURGE_TX | FT_PURGE_RX);
 450         if (presto->status != FT_OK)
 451                 result = ERROR_JTAG_DEVICE_ERROR;
 452
 453         presto->status = FT_Write(presto->handle, &presto_init_seq, sizeof(presto_init_seq), &ftbytes);
 454         if (presto->status != FT_OK || ftbytes != sizeof(presto_init_seq))
 455                 result = ERROR_JTAG_DEVICE_ERROR;
 456
 457         if ((presto->status = FT_SetLatencyTimer(presto->handle, 16)) != FT_OK)
 458                 result = ERROR_JTAG_DEVICE_ERROR;
 459
 460         if ((presto->status = FT_Close(presto->handle)) != FT_OK)
 461                 result = ERROR_JTAG_DEVICE_ERROR;
 462         else
 463                 presto->handle = (FT_HANDLE)INVALID_HANDLE_VALUE;
 464
 465 #elif BUILD_PRESTO_LIBFTDI == 1
 466
 467         if ((presto->retval = ftdi_write_data(&presto->ftdic, presto_init_seq, sizeof(presto_init_seq))) != sizeof(presto_init_seq))
 468                 result = ERROR_JTAG_DEVICE_ERROR;
 469
 470         if ((presto->retval = ftdi_set_latency_timer(&presto->ftdic, 16)) < 0)
 471                 result = ERROR_JTAG_DEVICE_ERROR;
 472
 473         if ((presto->retval = ftdi_usb_close(&presto->ftdic)) < 0)
 474                 result = ERROR_JTAG_DEVICE_ERROR;
 475         else
 476                 ftdi_deinit(&presto->ftdic);
 477 #endif
 478
 479         return result;
 480 }
 481
 482
 483 int presto_flush(void)
 484 {
 485         if (presto->buff_out_pos == 0)
 486                 return ERROR_OK;
 487
 488 #if BUILD_PRESTO_FTD2XX == 1
 489         if (presto->status != FT_OK)
 490 #elif BUILD_PRESTO_LIBFTDI == 1
 491         if (presto->retval < 0)
 492 #endif
 493         {
 494                 LOG_DEBUG("error in previous communication, canceling I/O operation");
 495                 return ERROR_JTAG_DEVICE_ERROR;
 496         }
 497
 498         if (presto_write(presto->buff_out, presto->buff_out_pos) != ERROR_OK)
 499         {
 500                 presto->buff_out_pos = 0;
 501                 return ERROR_JTAG_DEVICE_ERROR;
 502         }
 503
 504         presto->total_out += presto->buff_out_pos;
 505         presto->buff_out_pos = 0;
 506
 507         if (presto->buff_in_exp == 0)
 508                 return ERROR_OK;
 509
 510         presto->buff_in_pos = 0;
 511         presto->buff_in_len = 0;
 512
 513         if (presto_read(presto->buff_in, presto->buff_in_exp) != ERROR_OK)
 514         {
 515                 presto->buff_in_exp = 0;
 516                 return ERROR_JTAG_DEVICE_ERROR;
 517         }
 518
 519         presto->total_in += presto->buff_in_exp;
 520         presto->buff_in_len = presto->buff_in_exp;
 521         presto->buff_in_exp = 0;
 522
 523         return ERROR_OK;
 524 }
 525
 526
 527 int presto_sendbyte(int data)
 528 {
 529         if (data == EOF) return presto_flush();
 530
 531         if (presto->buff_out_pos < BUFFER_SIZE)
 532         {
 533                 presto->buff_out[presto->buff_out_pos++] = (u8)data;
 534                 if (((data & 0xC0) == 0x40) || ((data & 0xD0)== 0xD0))
 535                         presto->buff_in_exp++;
 536         }
 537         else
 538                 return ERROR_JTAG_DEVICE_ERROR;
 539
 540 #if BUILD_PRESTO_FTD2XX == 1
 541         if (presto->buff_out_pos >= BUFFER_SIZE)
 542 #elif BUILD_PRESTO_LIBFTDI == 1
 543         /* libftdi does not do background read, be sure that USB IN buffer does not overflow (128 bytes only!) */
 544         if (presto->buff_out_pos >= BUFFER_SIZE || presto->buff_in_exp==128)
 545 #endif
 546                 return presto_flush();
 547
 548         return ERROR_OK;
 549 }
 550
 551
 552 int presto_getbyte(void)
 553 {
 554         if (presto->buff_in_pos < presto->buff_in_len)
 555                 return presto->buff_in[presto->buff_in_pos++];
 556
 557         if (presto->buff_in_exp == 0)
 558                 return -1;
 559
 560         if (presto_flush() != ERROR_OK)
 561                 return -1;
 562
 563         if (presto->buff_in_pos<presto->buff_in_len)
 564                 return presto->buff_in[presto->buff_in_pos++];
 565
 566         return -1;
 567 }
 568
 569
 570 /* -------------------------------------------------------------------------- */
 571
 572
 573 int presto_bitq_out(int tms, int tdi, int tdo_req)
 574 {
 575         unsigned char cmdparam;
 576
 577         if (presto->jtag_tck == 0)
 578         {
 579                 presto_sendbyte(0xA4);
 580                 presto->jtag_tck = 1;
 581         }
 582
 583         else if (!tdo_req && tms == presto->jtag_tms)
 584         {
 585                 if (presto->jtag_tdi_count == 0)
 586                         presto->jtag_tdi_data = (tdi != 0);
 587                 else
 588                         presto->jtag_tdi_data |= (tdi != 0) << presto->jtag_tdi_count;
 589
 590                 if (++presto->jtag_tdi_count == 4)
 591                 {
 592                         presto->jtag_tdi_data |= (presto->jtag_tdi_count - 1) << 4;
 593                         presto_sendbyte(presto->jtag_tdi_data);
 594                         presto->jtag_tdi_count = 0;
 595                 }
 596                 return 0;
 597         }
 598
 599         if (presto->jtag_tdi_count)
 600         {
 601                 presto->jtag_tdi_data |= (presto->jtag_tdi_count - 1) << 4;
 602                 presto_sendbyte(presto->jtag_tdi_data);
 603                 presto->jtag_tdi_count = 0;
 604         }
 605
 606         if (tdi)
 607                 cmdparam = 0x0B;
 608         else
 609                 cmdparam = 0x0A;
 610
 611         presto_sendbyte( 0xC0 | cmdparam);
 612
 613         if (tms != presto->jtag_tms)
 614         {
 615                 if (tms)
 616                         presto_sendbyte(0xEC);
 617                 else
 618                         presto_sendbyte(0xE8);
 619                 presto->jtag_tms = tms;
 620         }
 621
 622         if (tdo_req)
 623                 presto_sendbyte(0xD4 | cmdparam);
 624         else
 625                 presto_sendbyte(0xC4|cmdparam);
 626
 627         return 0;
 628 }
 629
 630
 631 int presto_bitq_flush(void)
 632 {
 633         if (presto->jtag_tdi_count)
 634         {
 635                 presto->jtag_tdi_data |= (presto->jtag_tdi_count - 1) << 4;
 636                 presto_sendbyte(presto->jtag_tdi_data);
 637                 presto->jtag_tdi_count = 0;
 638         }
 639
 640         presto_sendbyte(0xCA);
 641         presto->jtag_tck = 0;
 642
 643         presto_sendbyte(0xA0);
 644
 645         return presto_flush();
 646 }
 647
 648
 649 int presto_bitq_in_rdy(void)
 650 {
 651         if (presto->buff_in_pos>=presto->buff_in_len)
 652                 return 0;
 653         return presto->buff_in_len-presto->buff_in_pos;
 654 }
 655
 656
 657 int presto_bitq_in(void)
 658 {
 659         if (presto->buff_in_pos>=presto->buff_in_len)
 660                 return -1;
 661         if (presto->buff_in[presto->buff_in_pos++]&0x08) return 1;
 662         return 0;
 663 }
 664
 665
 666 int presto_bitq_sleep(unsigned long us)
 667 {
 668         long waits;
 669
 670         if (us > 100000)
 671         {
 672                 presto_bitq_flush();
 673                 jtag_sleep(us);
 674                 return 0;
 675         }
 676
 677         waits = us / 170 + 2;
 678         while (waits--)
 679                 presto_sendbyte(0x80);
 680
 681         return 0;
 682 }
 683
 684
 685 int presto_bitq_reset(int trst, int srst)
 686 {
 687         unsigned char cmd;
 688
 689         cmd = 0xE8;
 690         if (presto->jtag_tms)
 691                 cmd |= 0x04;
 692
 693         if (trst || srst)
 694                 cmd |= 0x02;
 695
 696         presto_sendbyte(cmd);
 697         return 0;
 698 }
 699
 700
 701 /* -------------------------------------------------------------------------- */
 702
 703 char *presto_speed_text[4] =
 704 {
 705         "3 MHz",
 706         "1.5 MHz",
 707         "750 kHz",
 708         "93.75 kHz"
 709 };
 710
 711 int presto_jtag_speed(int speed)
 712 {
 713
 714         if ((speed < 0) || (speed > 3))
 715         {
 716                 LOG_INFO("valid speed values: 0 (3 MHz), 1 (1.5 MHz), 2 (750 kHz) and 3 (93.75 kHz)");
 717                 return ERROR_INVALID_ARGUMENTS;
 718         }
 719
 720         jtag_speed = speed;
 721         LOG_INFO("setting speed to %d, max. TCK freq. is %s", speed, presto_speed_text[speed]);
 722         return presto_sendbyte(0xA8 | speed);
 723 }
 724
 725
 726 char *presto_serial;
 727
 728 int presto_handle_serial_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 729 {
 730         if (argc == 1)
 731         {
 732                 if (presto_serial)
 733                         free(presto_serial);
 734                 presto_serial = strdup(args[0]);
 735         }
 736         else
 737         {
 738                 LOG_ERROR("expected exactly one argument to presto_serial <serial-number>");
 739         }
 740
 741         return ERROR_OK;
 742 }
 743
 744
 745 int presto_jtag_register_commands(struct command_context_s *cmd_ctx)
 746 {
 747         register_command(cmd_ctx, NULL, "presto_serial", presto_handle_serial_command,
 748                 COMMAND_CONFIG, NULL);
 749         return ERROR_OK;
 750 }
 751
 752
 753 int presto_jtag_init(void)
 754 {
 755         if (presto_open(presto_serial) != ERROR_OK)
 756         {
 757                 presto_close();
 758                 if (presto_serial != NULL)
 759                         LOG_ERROR("Cannot open PRESTO, serial number '%s'", presto_serial);
 760                 else
 761                         LOG_ERROR("Cannot open PRESTO");
 762                 return ERROR_JTAG_INIT_FAILED;
 763         }
 764         LOG_INFO("PRESTO open, serial number '%s'", presto->serial);
 765
 766         /* use JTAG speed setting from configuration file */
 767         presto_jtag_speed(jtag_speed);
 768
 769         bitq_interface = &presto_bitq;
 770         return ERROR_OK;
 771 }
 772
 773
 774 int presto_jtag_quit(void)
 775 {
 776         bitq_cleanup();
 777         presto_close();
 778         LOG_INFO("PRESTO closed");
 779
 780         if (presto_serial)
 781         {
 782                 free(presto_serial);
 783                 presto_serial = NULL;
 784         }
 785
 786         return ERROR_OK;
 787 }